JPS63214674A - Fault diagnosing device for transmitting and receiving module - Google Patents

Abstract

PURPOSE:To easily diagnose a fault of a transmitting and receiving module without providing any additional equipment to transmitting and receiving modules and an antenna system which is used while they are arranged and mounted by diagnosing the fault from whether or not the transmitting and receiving module oscillates owing to a loop gain. CONSTITUTION:When the fault of the transmitting sand receiving module is diagnosed, a loop is formed of a transmission and reception system at the time of fault diagnosis and transmitting high-output and receiving low-noise amplifies 1 and 2 are placed in an operation and a nonoperation state at the same time respectively to decides whether or not the transmitting and receiving module has the fault from whether or not the receiving amplifier enters loop oscillation. The fault of the module can be diagnosed whether or not oscillation occurs in those four modes, and the oscillation can be confirmed by detecting a high-frequency signal radiated from an antenna 6, a high-frequency signal appearing at a feeding side (terminal A), and variation of a bias current due to the oscillation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a failure diagnosis device for a transmitting/receiving module used in an electronically controlled antenna or the like.

[Conventional technology]

Figure 2 shows an example of the circuit configuration of a conventional transmitter/receiver module that has a fault diagnosis function. 4 is a transmitting/receiving switch with a terminator for protecting the transmitting low noise amplifier, 5a, 5
b is a directional coupler for monitoring the output of the transmitting/receiving system amplifier, and the transmitting/receiving module is composed of these elements 1 to 5. Further, 7 is a transmitting/receiving antenna.

Next, the operation will be explained. The transmitting special high output amplifier 1 is in operation, the low noise amplifier 2 is in the non-operating state, and the transmitting/receiving switch 4 is in the non-operating state.
is connected to the terminator. The high-frequency signal input to the terminal A is input into the high-power transmitting amplifier 1 by the circulator 3a, and then radiated into space via the circulator 3b and the antenna 7. However, a part of the output of the amplifier 1 is transmitted to the directional coupler. The output signal is taken out via terminal B through 5a, and this output signal can be used to diagnose a failure in the transmission system.

Next, during reception, the high-output amplifier 1 is inactive, the low-noise amplifier 2 is in the active state, and the transmitter/receiver switch 4 is connected to the input side terminal of the low-noise amplifier 2. The high frequency signal arriving from space is received by the antenna 7, and the circulator 3b,
After being input to the low-noise amplifier 2 via the transmitter/receiver switch 4, the signal is filtered and output from the terminal A via the circulator 3a.
A part of the output of the amplifier 2 is taken out to the terminal C via the directional coupler 5b, and this output signal can be used to diagnose a failure in the receiving system.

[Problem that the invention seeks to solve]

Conventional failure diagnosis for transmitter/receiver modules is performed as described above, so in order to diagnose failures in the transmitter/receiver system, a high frequency signal is input, and a directional coupler for output detection and a detection terminal are provided in each of the transmitter and receiver systems. In antenna systems that use a large number of transceiver modules mounted in an array, there were problems such as the antenna device becoming larger.The invention was made to solve the above problems. This makes it possible to diagnose the failure of transmitter/receiver modules without inputting high-frequency signals, and even in antenna systems where multiple transmitter/receiver modules are mounted in an array, it is possible to easily diagnose failures in individual modules without increasing the size of the antenna device. The object of the present invention is to obtain a failure diagnosis device for a transmitting/receiving module that enables diagnosis.

[Means for solving problems]

The failure diagnosis device for a transmitting/receiving module according to the present invention forms a loop with a failure diagnosis transmitting and receiving system, and operates the transmitting and receiving amplifiers alternately or simultaneously.

The presence or absence of a failure in the transmitting/receiving module is determined based on the presence or absence of loop oscillation in the transmitting and receiving amplifiers in each non-operating state.

[Effect]

The transmitting/receiving module failure diagnosis device in this invention includes:
Fault diagnosis is performed by detecting the presence or absence of loop oscillation by the transmitting and receiving amplifiers in a high frequency or DC manner, so there is no need to input high frequency signals, and the output detection direction required for each transmitting and receiving system is eliminated. This eliminates the need for a sex coupler and allows for easy failure diagnosis.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a transmitter/receiver module that is diagnosed by a failure diagnosis device according to an embodiment of the present invention. In the figure, 1 is a high-output amplifier for transmitting, 2 is a low-noise amplifier for receiving, and 3a and 3b are separated transmitting and receiving systems. 4 is a transmitting/receiving switch with a terminator to protect the transmitting low noise amplifier, and 6 is a limiter to prevent each stage amplifier from oversaturating when the transmitting/receiving system loop oscillates. Even if oversaturated, the amplifier may be damaged. If there is no one, it is not necessary, and it is also possible to place it in any position. The transmitting/receiving module is composed of these elements 1 to 4.6. Further, 7 is a transmitting/receiving antenna.

Further, an operation control means (not shown) 1 puts both the high-output amplifier 1 and the low-noise amplifier 2 into operation at the time of failure diagnosis.

They are set alternately to the operating state and both to the non-operating state.

In addition, a fault diagnosis means (not shown) detects the presence or absence of high frequencies appearing at the antenna or power supply terminal a in each of the above states, or detects changes in the DC bias of the amplifier 1.2, thereby determining the presence or absence of loop oscillation and, ultimately, detecting a failure. Detecting presence.

Next, the operation will be explained. In Figure 1, 1.~
The characteristics of each component 4 and 6 are as follows. In addition,
The units of the following characteristics are all in dB.

Gl: Gain when high-output amplifier 1 is operating LI: Loss when high-output amplifier 1 is not operating G2: Gain when low-noise amplifier 2 is operating L8: Loss when low-noise amplifier 2 is not operating L3: Isolation EF of circulator 3 4: Isolation to the low noise amplifier 2 side when the switch terminal of the transmitter/receiver switch 4 is connected to the dummy side L4: When the switch terminal of the transmitter/receiver switcher 4 is connected to the low noise amplifier 2 side Loss: Loss of limiter 6 Also, assume that there is the following relationship between the above values.

α==Qi −(Ll +2Ls +L4 +Lh'
)<0...(1) β-Gt (Ll +2
Ll + L4' + L6) < O...(2)
Equation (1) shows the state of the transmitting system operating and receiving system not operating, and equation (2) shows the state of transmitting system not operating and receiving system operating. If α≧0 or βnO, Since the transmitting and receiving system has a loop gain and oscillates, it is necessary that α<Q and β<0.

Next, consider the following four modes for fault diagnosis of the transmitter/receiver module.

■ Mode 1 (simultaneous operation of transmitting and receiving systems) Loop gain is γ
-G+ +G, (2L3 +Lm+L6), and if normal, α) becomes 0 and oscillates without fail. Therefore, if there is no oscillation, it can be determined that the module has failed. In this case, the main cause is considered to be an abnormality in the amplifier 1 or 2, resulting in a decrease in gain, or a poor connection between each component.

@Mode 2 (transmission system operating/receiving system non-operating) If the loop gain α becomes α>0 and oscillation occurs, it can be determined that there is a MOJ, -L, -L failure. In this case, failure of components 2 to 4 is considered to be the main cause.

O mode-3 (transmission system not operating, receiving system operating) If the loop gain β becomes β>0 and oscillation occurs, it can be determined that the module has failed. In this case, amplifier 1, circulator 3. The main cause is thought to be a failure of the transmitter/receiver switch 4.

(2) Mode 4 (transmission and reception systems not operating simultaneously) The loop gain δ is δ-Li +l, , +l, 3 +[, 4+LA, and under normal conditions there will be no oscillation. Therefore, if oscillation occurs, it can be determined that the module has failed. In this case, amplifier 1.
The main cause is considered to be failure No. 2 (cannot be made inoperable).

Module failure can be diagnosed based on the presence or absence of oscillation in the four modes described above, and oscillation can be detected by the following means.

■ Detection using high frequency signals radiated from antenna 6.

■ Detection using high frequency signals coming out on the power supply side (terminal A).

■ Detection based on changes in bias current due to oscillation.

The above methods of detection from ■ to 0 are possible both for the transmitter/receiver modules alone and for the modules arranged and mounted, and can be easily detected for the entire module and antenna device without any special additional equipment. Can perform fault diagnosis.

In the above embodiment, a circulator 3 is provided to separate transmission and reception, but a single-pole double-throw switch may be provided in place of the circulator 3, and the same effect as in the above embodiment can be obtained. play.

〔Effect of the invention〕

As described above, according to the failure diagnosis device for a transmitting/receiving module according to the present invention, the failure diagnosis of the transmitting/receiving module is performed based on the presence or absence of oscillation due to the loop gain of the transmitting/receiving module. This has the advantage that failure diagnosis of the transmitter/receiver module can be easily performed without providing any additional equipment to the antenna device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a transmitting/receiving module diagnosed by a diagnostic apparatus according to an embodiment of this invention, and FIG. 2 is a block diagram of a conventional transmitting/receiving module failure diagnosis circuit. In the figure, 1 is a high output amplifier for transmission, 2 is a low noise amplifier for reception, 3a and 3b are circulators, 4 is a switch with a terminator, 5 is a directional coupler, 6 is a limiter, and 7 is an antenna. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (6)

[Claims] (1) A device for diagnosing the failure of a transmitting/receiving module consisting of a high-output amplifier for transmitting, a low-noise amplifier for receiving, etc., in which both the transmitting and receiving systems of the module are in the operating state and alternately in the operating state during the fault diagnosis. , a transmitting/receiving module characterized in that it is equipped with an operation control means for setting each state to a non-operating state, and a failure diagnosis means for diagnosing a failure of the module based on the presence or absence of oscillation of a loop consisting of a transmitting and receiving system of the module. Fault diagnosis device. (2) The transmitter/receiver module includes two 3-hole circulators provided on the power feeding side and the antenna side, the high output amplifier and the low noise amplifier provided between the two circulators, the low noise amplifier and the above. 2. A failure diagnosis device for a transmitting/receiving module according to claim 1, further comprising a transmitting/receiving switch with a terminator provided between the three-hole circulator on the antenna side. (3) The transmitter/receiver module includes two single-pole double-throw switches provided on the power feeding side and the antenna side, the high-output amplifier and the low-noise amplifier provided between the two switches, and the low-noise amplifier. 2. The failure diagnosis device for a transmitting/receiving module according to claim 1, further comprising: a transmitting/receiving switch with a terminator provided between the single-pole double-throw switch on the antenna side. (4) The above-mentioned failure diagnosis means performs failure diagnosis of the module by detecting a high-frequency signal generated by oscillation caused by component failure, radiated from the antenna, or a signal output from the power supply side to the receiver. A failure diagnosis device for a transmitting/receiving module according to any one of claims 1 to 3. (5) The failure diagnosis means diagnoses the failure of the module by detecting a change in the amplifier bias current due to oscillation caused by a component failure. A failure diagnosis device for a transmitting/receiving module described in . (6) The transmitting/receiving module is mounted on an antenna device, and the failure diagnosis is performed in a state where the module is mounted and no high frequency signal is input. A failure diagnosis device for a transmitting/receiving module described in .